Process of making alpha cement composition



Patented Apr. 26, 1932 UNITED STATES lmlika PATENT OFFICE SIDNEY G.SEATON, OF LA. SALLE, ILLINOIS, ASSIGNOR TO UTICA HYDRAULIC CEMENT (30.,OF UTIOA, ILLINOIS, A CORPORATION OF ILLINOIS PROCESS OF MAKING A CEMENTCOMPOSITION No Drawing.

This invention relates to a new and useful composition for i nc reasingthe plastigty and ee iryiagat elitl ear cement and f6f"watr-pro9fi ngthe same, and more particulaYIyTii a novel process for preparing such acomposition.

Processes for water-proofing cement by incorporating in the cement awater-repellent composition have long been known.

10 These compositions consist for the most part of a soap formed bytreatinga vfatty @Qil with an alkali: "Another process forwater-proofing cement is disclosed in the patent to Mas No. 982 620. Maswater-proofs cement by adding thereto a water-proofing agent formed bytreating dry powdered lime with solid non-oleaginous palmitin in aheated, melted condition. He also states that he may replace the lime bysilica, clay, or any other mineral substance capable of being reduced ina mechanical way to a dry powder. However, Mas specifically states thatin his process there is no chemical reaction or even partialsaponification between the lime and the palmitin but that each minuteparticle of the powdered lime becomes externally coated with a thin filmof palmitin and is thus rendered waterrepelllent. d d 1 b t ave nowiscovere tiat y trea in a certain class of cements a fat bod insfi'tmeayts to cause wherein 1 icom nation to take place between thetwo'tlia t 'I mtutain a product far superior to that of I Mas, in thatsuch product not only renders cement water-repellent but also greatlyincreases the plasticity and sand-carrying capacity of the same. Asstated above, Mas forms his product by merely coating the particles ofhis powdered lime with a coating of a fat. On the other hand, myimproved product can only be formed by causing a che combination to takelace between meme fat bodie s e mployed W'ffie.

It is accordingly an object of this invention to provide a compositionfor treating cement to render the cement not only water-repellent butalso to increase the plasticity and sand-carrying capacity of the same.

Application filed September 13, 1929. Serial No. 892,491.

It is a further object of this invention to provide a process forchemically combining a fat body and a special cement in order to producea composition which, when added W a emlya aaallw parts to it verydesirable characteristics T Other and further important objects of thisinvention will become apparent from the following disclosures in thespecification and claims. 50

I may prepare my improved composition by what I term 'ther a wet mixlp gm ethgd or a dry mixin method.

In Tibt lf'iiie'ffi dsf the ingredients for imparting the desiredproperties to the cement 5 are a fat such as tallow or tl r e llge gr afatty aci suc 1 as a mi 10 stearic or oleic pr an The class of cementsto which I desire to to restrict my invention includes h draulic cement01;, any natural cement sfifistafitfil'l'y' ree rom basic oxides, suchas calcium, magiesti'lulfiprwltfn'iifiqfii oixides. In other wor s, 1ecements em 0 e are a natur or Portland cementn dt i equiring la cbess fiair or car ona 1on 0 cause set.

According to my preferred wet method, I employ tallow to furnish thefatty acid for my composition. I take 20 arts b weight go of thissubstance and heat it to to melt the same. I then addbnepa'ft'by'weiglltfi' reasetheterneeratnret h bollmg p ntgf wate r To this hot mixture Itheirs owly add a cement such as defined 86 above in finely dividmntil60 arts b weighthave begn added, malntalnlng The temperature 'a tapproximately 90 to 100 C. during the addition. The mixture is at thispoint of a dry consistency and is dumped 90 from the mix e1 aiid allowedft'iifgibblF *arresarusautatf tue'peial cement composition thusformed shows that a chemical combination of the fatty acid, or acids,has actually taken place, presumably with the alkali or double alkalisilicates of the cement. Proof of this lies in the fact that an etherextraction of the cement composition fails to show extraction ofappreciable quantities of any fat or fatty acid.

"IIIEIICH My alternative method, referred to as my dry method, comprisesadding the tallow to tion of water, and convertingthemixture to y ji tomiiosiif enlhy .tl e'l i rlis of heat as defined above.

While I have disclosed the temperatures in the above example as rangingfrom 90 to 100 C., it will be understood that such temperatures are notrestrictive, as satisfactory results may be obtained by employingtemperatures between the limits of 90 to 1 C. pressure being used formmn igeratures.

In treating cement with my novel composition, I add approximate y oneperce of the composition to the burnt emit as it comes ffdiii The kilnaiidt vh ile 1t is still in an unground form. The mixture of the burntcement rock and the special cement com osition is then assgg tl ou hlh eusgal ham r ner mills and haslbeen redii'ced't'o' ii'n ainfioatd,uniform powder.

The amount of my composition that I add to the burnt cement rock variesaccording to the amount of fatty acid that is desired to incorporate inthe finished cement. I usually add sufiicient of the mixture to 've afattyraoid content ranging, between p35}; 5 0. I hayciound however, thatfor best resu s a cement containing about 0.25% fatty acid is to bepreferred. W

A cement treated with my novel composition not only has the propertiesof greater plasticity and sand-carrying capacity but in addition has thefollowing advantages over untreated cement or cement treated by the oldprocesses.

Under the same grinding conditions cement rock to which has been addedthe special cement composition of my invention can be readily ground toa fineness which is several percent higher than was possible withuntreated cement rock. This materially creases the capacity of the grindiiii'f' liu pment. Moreover, this gen ent does no tend tobifild p in tlea ibqpprsi t mill and can be fed out of the packing ina- "chi'nes intobags without the use of air to make it flow freely.

I am aware that numerous details of my process may be varied withoutdeparting from the spirit of my invention, and I therefore do notpropose to limit myself in the patent granted excepted as necessitatedby the prior art.

I claim as my invention:

1. A process of preparing a composition for addition to a hydrauliccement to increase its plasticity and water-proofing qualities, whichcomprises heating a mixture of a fatty acid substance, a relativelysmall quantity of water and an excess quantity of a hydraulic cementsubstantially free of free basic oxides at a temperature above 80 C.

until substantially all of the fatty acid substance has reacted with thecement and the mixture is of a dry consistency and then allowing saidmixture to cool.

2. A process of preparing a composition for addition to a hydrauliccement to increase its plasticity and water-proofing qualities, whichcomprises melting 20 parts of tallow, adding about 1 part of water tosaid melted tallow, heating said water and tallow to approximately itsboiling point of water, adding thereto about 60 parts of a finelydivided hydraulic cement substantially free of free basic oxides andmaintaining the mixture at approximately 90 to 100 C. until the tallowhas practically completely reacted with the cement and the mixture is ofa dry consistency.

In testimony whereof I have hereunto subscribed my name at Utica, LaSalle County,

Ill.

SIDNEY G. SEATON.

